Which of the following is the best definition of an antibiotic
A. A chemical that is made in the pharmaceutical laboratory
B. Medications preferred because they are most effective as well as least toxic
C. A chemotherapeutic agent that harms the infectious organism
D. The concentration of the drug that destroys the pathogen
E. A product that is derived from the metabolism of living microorganisms
Answer: E. A product that is derived from the metabolism of living microorganisms
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The reference for taxonomic descriptions of bacteria is
A. Gray's Anatomy. B. Websters Manual of Taxonomic Bacteriology. C. Bergey's Manual of Systematic Bacteriology. D. Bacteriology.
Phenylacetic acid is added to the penicillin fermentation to allow incorporation of which side chain group?
A. Methyl B. Acetyl C. Benzyl D. Propyl
Refer to the accompanying figure. Antidiuretic hormone has its effects along the region labeled as:
a. 6. b. 7. c. 8. d. 9. e. 10.
Plants transport water to their leaves through the xylem when water evaporates from the leaves. The evaporating water pulls other water molecules up the xylem through ________.
A. hydrogen bonds B. covalent bonds C. ionic bonds D. hydrophobic interactions